Chemistry Test 11

Result

Chemistry Test 11

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Weekly Quiz Competition

Question 1
4 / -1

One gram sample of ammonium nitrate is decomposed in a bomb calorimeter. The temperature of calorimeter increases by 6.12 K. The heat capacity of the system is 1.23 kJ/g/deg. What is the molar heat of decomposition of NH₄ NO₃

A
–7.53 kJ mol^–1

B
–398.1 kJ mol^–1

C
–16.1 kJ mol^–1

D
–602 kJ mol^–1

Solution

C . ΔT = (1.23 kJ/K)(6.12 K) = 7.53 kJ

Molar mass of NH4NO3 = 80 g/mol

When 1 g NH4NO3 decomposed, 7.53 kJ of heat is released

When 80 g which is 1 mol NH4NO3 decompose, the heat will be;

(80 g/mol x 7.53 kJ) / 1 g = 602.4 kJ/mol

is the molar heat of decomposition for ammonium nitrate.
Question 2
4 / -1

In a balanced equation H₂SO₄ + x HI → H₂S + yI₂ + zH₂O, the values of x, y, z are

A
x = 3, y = 5, z = 2

B
x = 4, y = 8, z = 5

C
x = 8, y = 4, z = 4

D
x = 5, y = 3, z = 4

Solution

The values of x, y, z are 8, 4, 4 respectively hence the reaction is

H₂SO₄ + 8HI → H₂S + 4I₂ + 4H₂O